1. McGraw-Hill©The McGraw-Hill Companies, Inc., 2000 Powerpoint Templates Computer Communication and Networks Lecture # 03 CS-3323 Muhammad Waseem Iqbal Data Communication, University of Lahore, Pakistan

2. DATA COMMUNICATIONS DATA COMMUNICATIONS The term telecommunication means communication at a distance. The word data refers to information presented in whatever form is agreed upon by the parties creating and using the data. Data communications are the exchange of data between two devices via some form of transmission medium such as a wire cable. Components Data Representation Data Flow Topics discussed in this section: Data Communication, University of Lahore, Pakistan

3. Figure Five components of data communication Data Communication, University of Lahore, Pakistan

4. Figure Data flow (simplex, half-duplex, and full-duplex) Data Communication, University of Lahore, Pakistan

5. NETWORKS A network is a set of devices (often referred to as nodes) connected by communication links. A node can be a computer, printer, or any other device capable of sending and/or receiving data generated by other nodes on the network. Distributed Processing Network Criteria Physical Structures Network Models Categories of Networks Interconnection of Networks: Internetwork Topics discussed in this section: Data Communication, University of Lahore, Pakistan

6. Figure Types of connections: point-to-point and multipoint Data Communication, University of Lahore, Pakistan

7. Figure Categories of topology Data Communication, University of Lahore, Pakistan

8. Figure A fully connected mesh topology (five devices) Data Communication, University of Lahore, Pakistan

9. Figure A star topology connecting four stations Data Communication, University of Lahore, Pakistan

10. Figure A bus topology connecting three stations Data Communication, University of Lahore, Pakistan

11. Figure A ring topology connecting six stations Data Communication, University of Lahore, Pakistan

12. Figure A hybrid topology: a star backbone with three bus networks Data Communication, University of Lahore, Pakistan

13. Figure An isolated LAN connecting 12 computers to a hub in a closet Data Communication, University of Lahore, Pakistan

14. Figure WANs: a switched WAN and a point-to-point WAN Data Communication, University of Lahore, Pakistan